55770917 has 2 divisors, whose sum is σ = 55770918. Its totient is φ = 55770916.

The previous prime is 55770899. The next prime is 55770941. The reversal of 55770917 is 71907755.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48636676 + 7134241 = 6974^2 + 2671^2 .

It is a cyclic number.

It is not a de Polignac number, because 55770917 - 2⁶ = 55770853 is a prime.

It is a super-2 number, since 2×55770917² = 6220790366041778, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55770977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27885458 + 27885459.

It is an arithmetic number, because the mean of its divisors is an integer number (27885459).

Almost surely, 2^55770917 is an apocalyptic number.

It is an amenable number.

55770917 is a deficient number, since it is larger than the sum of its proper divisors (1).

55770917 is an equidigital number, since it uses as much as digits as its factorization.

55770917 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 77175, while the sum is 41.

The square root of 55770917 is about 7467.9928360973. The cubic root of 55770917 is about 382.0638330688.

The spelling of 55770917 in words is "fifty-five million, seven hundred seventy thousand, nine hundred seventeen".